package com.cwb.study.springbootstudy.component;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @author ：chenwenbin
 * @date ：Created in 2019/08/08 11:55
 * @description：登陆检查拦截器
 */
public class LoginHandlerInterceptor implements HandlerInterceptor {
    //目标方法执行之前,
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object loginUser = request.getSession().getAttribute("loginUser");
        if (loginUser == null){
            //未登录,返回登录页面
            request.setAttribute("msg","没有权限,请先登陆");
            //转发
            request.getRequestDispatcher("/index.html").forward(request,response);
        }else {
            //已登陆,放行请求
            return true;
        }
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
